Descriptive Attribute	Value(s)
Abuts	Locus 17.
Stage	Stage 3
Stage Description	Subflooring construction.
Description	This locus is represented by the remnants of twelve terracotta tile hypocaust columns. The columns are constructed of terracotta tiles. The base of each column consisted of 2-3 square terracotta tiles (depending on thickness; average sizes: 0.30 m x 0.30 m x 0.07 m). Surmounting these square tiles was a stack of circular terracotta tiles (average size: diameter: 0.22-0.23 m; thickness 0.6-0.7 m). The original height of each column was between 0.60-0.62 m, with the variance probably being accommodated by the use of mortar. The exact number of circular tiles in each column varied based on tile thickness. All of the terracotta tiles appear to be have been laid using thin layers of wet mortar, but the state of preservation belies certainty on this point. The rows of circular tile columns in the subflooring is localized to the north south expanse between the Semi-circular Feature (Locus 10) and the South Wall (Locus 2). The subflooring support structure to the east and west of this area utilized piers or vaults constructed from square tiles (see Loci 18, 19B).
Top (m)	Opening elevation: 899.61 m.
Overlies	Locus 17.
Preserved Height	0.60-0.62 m.
Combined with	Loci 11A, 11B, 17, 18, 19B, 20, 21, 22, 23, 24, 25, 28, 30, 32.
Phase Description	Phase VI: Late Nabataean pre-CE 106 minor collapses and repairs. At this time the northwest subterranean...
Location	Subflooring, north south expanse between Locus 10 and Locus 2.
Size	Average per column: 0.30 m north south-by-0.30 m east west; diameter 0.22 m.
Phase	VI
Definition	Terracotta Tile Hypocaust Columns
Underlies	Locus 12.
Bottom (m)	Closing elevation: 899.01 m.
Bonds to	None.
Architectural or Soil Locus?	Architectural